In angiosperms, microsporogenesis and megasporogenesis?
1. Occur in anther
2. Form gametes without further divisions
3. Involve meiosis
4. Occur in ovule
Male gametophyte in angiosperms produces?
1. Two sperms and a vegetative cell
2. Single sperm and a vegetative cell
3. Single sperm and two vegetative cells
4. Three sperms
Which one of the following statements is not true?
1. | Pollen grains are rich in nutrients and they are used in the form of tablets and syrups |
2. | Pollen grains of some plants cause severe allergies and bronchial afflictions in some people |
3. | The flowers pollinated by flies and beetles secrete foul odour to attract them |
4. | Honey is made by bees by digesting pollen collected from flowers |
Male gametophyte with least number of cells is present in:
1. Pteris
2. Funaria
3. Lilium
4. Pinus
Pollen tablets are available in the market for:
1. | In vitro fertilization | 2. | Breeding programmes |
3. | Supplementing food | 4. | Ex-situ conservation |
1. | Sporopollenin can be degraded by enzymes |
2. | Sporopollenin in made up of inorganic materials |
3. | Sporopollenin can withstand high temperatures as well as strong acids and alkalis |
4. | Sporopollenin can withstand high temperatures but not strong acids |
Which one of the following statements is wrong?
1. | Vegetative cell is larger than generative cell |
2. | Pollen grains in some plants remain viable for months |
3. | Intine is made up of cellulose and pectin |
4. | When pollen is shed at a two-celled stage, double fertilization does not take place |